mix.c
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/*
TiMidity -- Experimental MIDI to WAVE converter
Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>
Suddenly, you realize that this program is free software; you get
an overwhelming urge to redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received another copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
I bet they'll be amazed.
mix.c */
#include <math.h>
#include <stdio.h>
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#include <stdlib.h>
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#include "config.h"
#include "common.h"
#include "instrum.h"
#include "playmidi.h"
#include "output.h"
#include "controls.h"
#include "tables.h"
#include "resample.h"
#include "mix.h"
/* Returns 1 if envelope runs out */
int recompute_envelope(int v)
{
int stage;
stage = voice[v].envelope_stage;
if (stage>5)
{
/* Envelope ran out. */
int tmp=(voice[v].status == VOICE_DIE); /* Already displayed as dead */
voice[v].status = VOICE_FREE;
if(!tmp)
ctl->note(v);
return 1;
}
if (voice[v].sample->modes & MODES_ENVELOPE)
{
if (voice[v].status==VOICE_ON || voice[v].status==VOICE_SUSTAINED)
{
if (stage>2)
{
/* Freeze envelope until note turns off. Trumpets want this. */
voice[v].envelope_increment=0;
return 0;
}
}
}
voice[v].envelope_stage=stage+1;
if (voice[v].envelope_volume==voice[v].sample->envelope_offset[stage])
return recompute_envelope(v);
voice[v].envelope_target=voice[v].sample->envelope_offset[stage];
voice[v].envelope_increment = voice[v].sample->envelope_rate[stage];
if (voice[v].envelope_target<voice[v].envelope_volume)
voice[v].envelope_increment = -voice[v].envelope_increment;
return 0;
}
void apply_envelope_to_amp(int v)
{
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FLOAT_T lamp=voice[v].left_amp, ramp, lramp, rramp, ceamp, lfeamp;
int32 la,ra, lra, rra, cea, lfea;
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if (voice[v].panned == PANNED_MYSTERY)
{
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lramp=voice[v].lr_amp;
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ramp=voice[v].right_amp;
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ceamp=voice[v].ce_amp;
rramp=voice[v].rr_amp;
lfeamp=voice[v].lfe_amp;
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if (voice[v].tremolo_phase_increment)
{
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FLOAT_T tv = voice[v].tremolo_volume;
lramp *= tv;
lamp *= tv;
ceamp *= tv;
ramp *= tv;
rramp *= tv;
lfeamp *= tv;
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}
if (voice[v].sample->modes & MODES_ENVELOPE)
{
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FLOAT_T ev = (FLOAT_T)vol_table[voice[v].envelope_volume>>23];
lramp *= ev;
lamp *= ev;
ceamp *= ev;
ramp *= ev;
rramp *= ev;
lfeamp *= ev;
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}
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la = (int32)FSCALE(lamp,AMP_BITS);
ra = (int32)FSCALE(ramp,AMP_BITS);
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lra = (int32)FSCALE(lramp,AMP_BITS);
rra = (int32)FSCALE(rramp,AMP_BITS);
cea = (int32)FSCALE(ceamp,AMP_BITS);
lfea = (int32)FSCALE(lfeamp,AMP_BITS);
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if (la>MAX_AMP_VALUE) la=MAX_AMP_VALUE;
if (ra>MAX_AMP_VALUE) ra=MAX_AMP_VALUE;
if (lra>MAX_AMP_VALUE) lra=MAX_AMP_VALUE;
if (rra>MAX_AMP_VALUE) rra=MAX_AMP_VALUE;
if (cea>MAX_AMP_VALUE) cea=MAX_AMP_VALUE;
if (lfea>MAX_AMP_VALUE) lfea=MAX_AMP_VALUE;
voice[v].lr_mix=FINAL_VOLUME(lra);
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voice[v].left_mix=FINAL_VOLUME(la);
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voice[v].ce_mix=FINAL_VOLUME(cea);
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voice[v].right_mix=FINAL_VOLUME(ra);
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voice[v].rr_mix=FINAL_VOLUME(rra);
voice[v].lfe_mix=FINAL_VOLUME(lfea);
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}
else
{
if (voice[v].tremolo_phase_increment)
lamp *= voice[v].tremolo_volume;
if (voice[v].sample->modes & MODES_ENVELOPE)
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lamp *= (FLOAT_T)vol_table[voice[v].envelope_volume>>23];
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la = (int32)FSCALE(lamp,AMP_BITS);
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if (la>MAX_AMP_VALUE)
la=MAX_AMP_VALUE;
voice[v].left_mix=FINAL_VOLUME(la);
}
}
static int update_envelope(int v)
{
voice[v].envelope_volume += voice[v].envelope_increment;
/* Why is there no ^^ operator?? */
if (((voice[v].envelope_increment < 0) &&
(voice[v].envelope_volume <= voice[v].envelope_target)) ||
((voice[v].envelope_increment > 0) &&
(voice[v].envelope_volume >= voice[v].envelope_target)))
{
voice[v].envelope_volume = voice[v].envelope_target;
if (recompute_envelope(v))
return 1;
}
return 0;
}
static void update_tremolo(int v)
{
int32 depth=voice[v].sample->tremolo_depth<<7;
if (voice[v].tremolo_sweep)
{
/* Update sweep position */
voice[v].tremolo_sweep_position += voice[v].tremolo_sweep;
if (voice[v].tremolo_sweep_position>=(1<<SWEEP_SHIFT))
voice[v].tremolo_sweep=0; /* Swept to max amplitude */
else
{
/* Need to adjust depth */
depth *= voice[v].tremolo_sweep_position;
depth >>= SWEEP_SHIFT;
}
}
voice[v].tremolo_phase += voice[v].tremolo_phase_increment;
/* if (voice[v].tremolo_phase >= (SINE_CYCLE_LENGTH<<RATE_SHIFT))
voice[v].tremolo_phase -= SINE_CYCLE_LENGTH<<RATE_SHIFT; */
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voice[v].tremolo_volume = (FLOAT_T)
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(1.0 - FSCALENEG((sine(voice[v].tremolo_phase >> RATE_SHIFT) + 1.0)
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* depth * TREMOLO_AMPLITUDE_TUNING,
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/* I'm not sure about the +1.0 there -- it makes tremoloed voices'
volumes on average the lower the higher the tremolo amplitude. */
}
/* Returns 1 if the note died */
static int update_signal(int v)
{
if (voice[v].envelope_increment && update_envelope(v))
return 1;
if (voice[v].tremolo_phase_increment)
update_tremolo(v);
apply_envelope_to_amp(v);
return 0;
}
#ifdef LOOKUP_HACK
# define MIXATION(a) *lp++ += mixup[(a<<8) | (uint8)s];
#else
# define MIXATION(a) *lp++ += (a)*s;
#endif
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#define MIXSKIP lp++
#define MIXMAX(a,b) *lp++ += ((a>b)?a:b) * s
#define MIXCENT(a,b) *lp++ += (a/2+b/2) * s
#define MIXHALF(a) *lp++ += (a>>1)*s;
static void mix_mystery_signal(resample_t *sp, int32 *lp, int v, int count)
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{
Voice *vp = voice + v;
final_volume_t
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left_rear=vp->lr_mix,
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left=vp->left_mix,
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center=vp->ce_mix,
right=vp->right_mix,
right_rear=vp->rr_mix,
lfe=vp->lfe_mix;
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int cc;
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resample_t s;
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if (!(cc = vp->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
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left_rear = vp->lr_mix;
left = vp->left_mix;
center = vp->ce_mix;
right = vp->right_mix;
right_rear = vp->rr_mix;
lfe = vp->lfe_mix;
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}
while (count)
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
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MIXATION(left);
MIXATION(right);
if (num_ochannels >= 4) {
MIXATION(left_rear);
MIXATION(right_rear);
}
if (num_ochannels == 6) {
MIXATION(center);
MIXATION(lfe);
}
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}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
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left_rear = vp->lr_mix;
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left = vp->left_mix;
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center = vp->ce_mix;
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right = vp->right_mix;
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right_rear = vp->rr_mix;
lfe = vp->lfe_mix;
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}
else
{
vp->control_counter = cc - count;
while (count--)
{
s = *sp++;
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MIXATION(left);
MIXATION(right);
if (num_ochannels >= 4) {
MIXATION(left_rear);
MIXATION(right_rear);
}
if (num_ochannels == 6) {
MIXATION(center);
MIXATION(lfe);
}
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}
return;
}
}
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static void mix_center_signal(resample_t *sp, int32 *lp, int v, int count)
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{
Voice *vp = voice + v;
final_volume_t
left=vp->left_mix;
int cc;
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resample_t s;
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if (!(cc = vp->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
while (count)
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXATION(left);
}
else if (num_ochannels == 4) {
MIXATION(left);
MIXSKIP;
MIXATION(left);
MIXSKIP;
}
else if (num_ochannels == 6) {
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXATION(left);
MIXATION(left);
}
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}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
else
{
vp->control_counter = cc - count;
while (count--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXATION(left);
}
else if (num_ochannels == 4) {
MIXATION(left);
MIXSKIP;
MIXATION(left);
MIXSKIP;
}
else if (num_ochannels == 6) {
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXATION(left);
MIXATION(left);
}
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}
return;
}
}
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static void mix_single_left_signal(resample_t *sp, int32 *lp, int v, int count)
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{
Voice *vp = voice + v;
final_volume_t
left=vp->left_mix;
int cc;
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resample_t s;
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if (!(cc = vp->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
while (count)
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXSKIP;
}
if (num_ochannels >= 4) {
MIXHALF(left);
MIXSKIP;
MIXATION(left);
MIXSKIP;
}
if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
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}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
else
{
vp->control_counter = cc - count;
while (count--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXSKIP;
}
if (num_ochannels >= 4) {
MIXHALF(left);
MIXSKIP;
MIXATION(left);
MIXSKIP;
}
if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
}
return;
}
}
static void mix_single_right_signal(resample_t *sp, int32 *lp, int v, int count)
{
Voice *vp = voice + v;
final_volume_t
left=vp->left_mix;
int cc;
resample_t s;
if (!(cc = vp->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
while (count)
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
if (num_ochannels == 2) {
MIXSKIP;
MIXATION(left);
}
if (num_ochannels >= 4) {
MIXSKIP;
MIXHALF(left);
MIXSKIP;
MIXATION(left);
} if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
else
{
vp->control_counter = cc - count;
while (count--)
{
s = *sp++;
if (num_ochannels == 2) {
MIXSKIP;
MIXATION(left);
}
if (num_ochannels >= 4) {
MIXSKIP;
MIXHALF(left);
MIXSKIP;
MIXATION(left);
} if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
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}
return;
}
}
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static void mix_mono_signal(resample_t *sp, int32 *lp, int v, int count)
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{
Voice *vp = voice + v;
final_volume_t
left=vp->left_mix;
int cc;
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resample_t s;
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if (!(cc = vp->control_counter))
{
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
while (count)
if (cc < count)
{
count -= cc;
while (cc--)
{
s = *sp++;
MIXATION(left);
}
cc = control_ratio;
if (update_signal(v))
return; /* Envelope ran out */
left = vp->left_mix;
}
else
{
vp->control_counter = cc - count;
while (count--)
{
s = *sp++;
MIXATION(left);
}
return;
}
}
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static void mix_mystery(resample_t *sp, int32 *lp, int v, int count)
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{
final_volume_t
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left_rear=voice[v].lr_mix,
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left=voice[v].left_mix,
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center=voice[v].ce_mix,
right=voice[v].right_mix,
right_rear=voice[v].rr_mix,
lfe=voice[v].lfe_mix;
resample_t s;
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while (count--)
{
s = *sp++;
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MIXATION(left);
MIXATION(right);
if (num_ochannels >= 4) {
MIXATION(left_rear);
MIXATION(right_rear);
}
if (num_ochannels == 6) {
MIXATION(center);
MIXATION(lfe);
}
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}
}
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static void mix_center(resample_t *sp, int32 *lp, int v, int count)
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{
final_volume_t
left=voice[v].left_mix;
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resample_t s;
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while (count--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXATION(left);
}
else if (num_ochannels == 4) {
MIXATION(left);
MIXATION(left);
MIXSKIP;
MIXSKIP;
}
else if (num_ochannels == 6) {
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXATION(left);
MIXATION(left);
}
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}
}
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static void mix_single_left(resample_t *sp, int32 *lp, int v, int count)
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{
final_volume_t
left=voice[v].left_mix;
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resample_t s;
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while (count--)
{
s = *sp++;
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if (num_ochannels == 2) {
MIXATION(left);
MIXSKIP;
}
if (num_ochannels >= 4) {
MIXHALF(left);
MIXSKIP;
MIXATION(left);
MIXSKIP;
}
if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
}
}
static void mix_single_right(resample_t *sp, int32 *lp, int v, int count)
{
final_volume_t
left=voice[v].left_mix;
resample_t s;
while (count--)
{
s = *sp++;
if (num_ochannels == 2) {
MIXSKIP;
MIXATION(left);
}
if (num_ochannels >= 4) {
MIXSKIP;
MIXHALF(left);
MIXSKIP;
MIXATION(left);
}
if (num_ochannels == 6) {
MIXSKIP;
MIXATION(left);
}
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}
}
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static void mix_mono(resample_t *sp, int32 *lp, int v, int count)
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{
final_volume_t
left=voice[v].left_mix;
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resample_t s;
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while (count--)
{
s = *sp++;
MIXATION(left);
}
}
/* Ramp a note out in c samples */
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static void ramp_out(resample_t *sp, int32 *lp, int v, int32 c)
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{
/* should be final_volume_t, but uint8 gives trouble. */
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int32 left_rear, left, center, right, right_rear, lfe, li, ri;
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resample_t s = 0; /* silly warning about uninitialized s */
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/* Fix by James Caldwell */
if ( c == 0 ) c = 1;
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left = voice[v].left_mix;
li = -(left/c);
if (!li) li = -1;
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/* printf("Ramping out: left=%d, c=%d, li=%d\n", left, c, li); */
if (!(play_mode->encoding & PE_MONO))
{
if (voice[v].panned==PANNED_MYSTERY)
{
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left_rear = voice[v].lr_mix;
center=voice[v].ce_mix;
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right=voice[v].right_mix;
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right_rear = voice[v].rr_mix;
lfe = voice[v].lfe_mix;
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ri=-(right/c);
while (c--)
{
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left_rear += li; if (left_rear<0) left_rear=0;
left += li; if (left<0) left=0;
center += li; if (center<0) center=0;
right += ri; if (right<0) right=0;
right_rear += ri; if (right_rear<0) right_rear=0;
lfe += li; if (lfe<0) lfe=0;
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s=*sp++;
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MIXATION(left);
MIXATION(right);
if (num_ochannels >= 4) {
MIXATION(left_rear);
MIXATION(right_rear);
}
if (num_ochannels == 6) {
MIXATION(center);
MIXATION(lfe);
}
718
719
720
721
722
723
724
725
726
727
}
}
else if (voice[v].panned==PANNED_CENTER)
{
while (c--)
{
left += li;
if (left<0)
return;
s=*sp++;
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
if (num_ochannels == 2) {
MIXATION(left);
MIXATION(left);
}
else if (num_ochannels == 4) {
MIXATION(left);
MIXATION(left);
MIXSKIP;
MIXSKIP;
}
else if (num_ochannels == 6) {
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXSKIP;
MIXATION(left);
MIXATION(left);
}
746
747
748
749
750
751
752
753
754
755
756
}
}
else if (voice[v].panned==PANNED_LEFT)
{
while (c--)
{
left += li;
if (left<0)
return;
s=*sp++;
MIXATION(left);
757
758
759
760
761
762
763
764
MIXSKIP;
if (num_ochannels >= 4) {
MIXATION(left);
MIXSKIP;
} if (num_ochannels == 6) {
MIXATION(left);
MIXATION(left);
}
765
766
767
768
769
770
771
772
773
774
}
}
else if (voice[v].panned==PANNED_RIGHT)
{
while (c--)
{
left += li;
if (left<0)
return;
s=*sp++;
776
MIXATION(left);
777
778
779
780
781
782
783
if (num_ochannels >= 4) {
MIXSKIP;
MIXATION(left);
} if (num_ochannels == 6) {
MIXATION(left);
MIXATION(left);
}
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
}
}
}
else
{
/* Mono output. */
while (c--)
{
left += li;
if (left<0)
return;
s=*sp++;
MIXATION(left);
}
}
}
/**************** interface function ******************/
void mix_voice(int32 *buf, int v, int32 c)
{
Voice *vp=voice+v;
807
808
809
int32 count=c;
resample_t *sp;
if (c<0) return;
810
811
if (vp->status==VOICE_DIE)
{
812
813
814
815
if (count>=MAX_DIE_TIME)
count=MAX_DIE_TIME;
sp=resample_voice(v, &count);
ramp_out(sp, buf, v, count);
816
817
818
819
vp->status=VOICE_FREE;
}
else
{
820
821
sp=resample_voice(v, &count);
if (count<0) return;
822
823
824
825
if (play_mode->encoding & PE_MONO)
{
/* Mono output. */
if (vp->envelope_increment || vp->tremolo_phase_increment)
826
mix_mono_signal(sp, buf, v, count);
827
else
828
mix_mono(sp, buf, v, count);
829
830
831
832
833
834
}
else
{
if (vp->panned == PANNED_MYSTERY)
{
if (vp->envelope_increment || vp->tremolo_phase_increment)
835
mix_mystery_signal(sp, buf, v, count);
836
else
837
mix_mystery(sp, buf, v, count);
838
839
840
841
}
else if (vp->panned == PANNED_CENTER)
{
if (vp->envelope_increment || vp->tremolo_phase_increment)
842
mix_center_signal(sp, buf, v, count);
843
else
844
mix_center(sp, buf, v, count);
845
846
847
848
849
850
851
}
else
{
/* It's either full left or full right. In either case,
every other sample is 0. Just get the offset right: */
if (vp->envelope_increment || vp->tremolo_phase_increment)
852
853
854
855
856
{
if (vp->panned == PANNED_RIGHT)
mix_single_right_signal(sp, buf, v, count);
else mix_single_left_signal(sp, buf, v, count);
}
857
else
858
859
860
861
862
{
if (vp->panned == PANNED_RIGHT)
mix_single_right(sp, buf, v, count);
else mix_single_left(sp, buf, v, count);
}
863
864
865
866
}
}
}
}